Add factory methods for libgdx primitive type arrays

[Divelix]

I just used com.badlogic.gdx.utils.FloatArray to serialize array of floats to json and came up with the fact that I can't generate them easily for no argument constructor, so I did that thing:

fun gdxFloatArrayOf(vararg elements: Float): GdxFloatArray = GdxFloatArray(elements)

And now I can write concise data classes for serialization purposes:

data class A(
        val floats1: GdxFloatArray = gdxFloatArrayOf(),
        val floats2: GdxFloatArray = gdxFloatArrayOf(),
)

I just thought it would be nice to have factory functions for all libgdx primitive type arrays in ktx.collections.
Here are the ones I could find:

• BooleanArray
• ByteArray
• CharArray
• FloatArray
• IntArray
• LongArray
• ShortArray

[czyzby]

Makes sense, thanks for the suggestion. Turns out I cannot convert the discussion into an issue, but I've created a new one to track progress. If you'd like to submit a pull request, please reference #334. Thanks!

[czyzby]

The factory methods were implemented by @vrudas in #334. Thanks!